Gas carburetor



Oct. l5, 1940. w. E. CLAYTON GAS cAxuaEToa Filed Nov. 8. 1939 ATTOR NEYS Patented Oct. 15, 1940 'UNITED STATES 4PM151m- OFFICE GAS CRBURETORWilliamE. Clayton, Independence, Kans. Y l

Application November 8, 1939, Serial No. 303,487 s claims. (o1. @1s-18o)vThis invention relates to gas carburetors and has for an objectltoprovide a carburetor which may be attached to the air-intake of aconventional gasoline carburetor so that the'internal combustion enginemay run on gasoline'for lield work and on naturalgas for stationarywork.

v A further object is Ito provide a carburetor of thistype whichmay beYeasily adjusted from the 4exterior of the carburetor, and whichwill-employ a--double valve vconstruction in which a diaphragm lwillopena small gas 'valve `to feed gasto the engine under the influence ofa very small amount of vacuum created by the pistons, the diaphragmsubsequently opening falarge :gas valve when the engine needs more gas."A Vfurther object is to provide a carburetor of this type which will"ce formed of a few strong simple and durable parts which will 'be'inexpen-j sive to manufacture and which will noteasily get outof order.f

" "With the-above and other objects in -view'the invention consists ofcertain novel details of construction and combinations ofparts-hereinafter fully-described and claimed, it being understoodl thatvarious modiiications may be resorted to` within the scope of theappended claims without departing from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawing forming part o this specification,

vFigure 1 is a longitudinal sectional viewof a carburetor constructed inaccordance` with the invention.

Figure'Z is a longitudinal sectional view of the carburetor shown inFigure 1 showing the diaphragm holding both valves open.

Figure 3 is a cross sectional view, drawn to small scale, and taken onthe line 3 3 of Figure 1.

Referring now to the drawing in which like characters of referencedesignate similar parts in the various views, the gas carburetorincludes a circular housing I0 formed of similar sections I I and I2, ofcast metal, having respective annular flanges I3 and I4 between which issecured a rubber diaphragm I5, by means of a plurality of bolts I6 whichhold the sections together.

A threaded valve stem I'I is engaged axially through the housing and isprovided on its lower end with a small valve I8. vA disc I9 is threadedat its center onto the valve stem Il below the diaphragm I5. A seconddisc 2D is loosely mounted at its center on the valve stern and engagesthe top surface of the diaphragm. A tubular member 2l is threaded ontothe valve stem and abuts the upper disc 20. The tubular member isslidedly engaged in an opening 22 formed inthe upper section `I I andprojectsabove the section vto receive a helical spring 23 which issleeved on the member and at thebottom bears upon a bo`s`s24 which isintegral with the top `of the Vsection II. The spring bearsagainst awasher 25 which is conned' on the 'valve stem at the top thereof throughthe-medium of a nut 26.

' The small valve I8 seats in a valve seat 21T coin-y centricallydisposed in a large disc valve 28 having a tubular stem-29 projectingloosely through a relatively large axial port 3B formed in the bottom ofthe lower section I2 of the housing. The tubu-L lar stem is of greaterinternal diameter than the external diameter of thevalve stem I'I andextends to a point ljustbelow the lower disc I9. A lower series of ports3i is formed vin the tubular stem 29 near the bottom thereof andan upperseries of `ports 32 isl formed in the stem near vthe top thereof. j

A pipe 33 is formed integral with the bottom section and is internallythreadedto be screwed onto alnatural `gas supply pipe, not shown. A vent34 lis formed in the side of the upper section to permit atmosphericpressure to act. upon the diaphragm above the valves 21 and 28.

Connected by a pipe 35 to the lower section I2 of the housing is amixing chamber comprising a cylindrical body 36 having the upper endthereof closed by a top wall 3l provided with an arcuate slot 38. Acup-shaped member 39 is provided with a bottom wall 40 which ispivotally secured to the top wall 3l of the mixing chamber through themedium of a pivot bolt 4I. The cup-shaped member is provided With anarcaute slot 42 adapted to be joined into full register or part registerwith the slot 3B in the mixing chamber when the cup-shaped member 39 isrotated axially to regulate the amount of air drawn into the mixingchamber from the atmosphere to the cup-shaped member 39. 'I'he bottom ofthe mixing chamber` is open and is adapted to communicate with the Yair-intake of a conventional carburetor of an internal combustionengine.

A valve 43 is seated on a seat 44 formed on the v phragm I5 will bepulled downwardly with re- V sultant opening of the small valve I8 tofeed the natural gas to the mixing chamber. However, when the enginespeed increases and greater vacuum is pulled upon the diaphragm, thediaphragm will be moved downwardly through the space between it and thetop of the tubular stem 29 until it impinges against the top of thetubular valve stem, as shown in Figure 2, to open the large valve 28 andpermit more gas to be fed to the mixing chamber.

From the above description it is thought that the construction andoperation of the invention will be fully understood without furtherexplanation.

What is claimed is:

1. A natural gas carburetor comprising a housing, a transverselydisposed diaphragm in the housing, the housing being vented to theatmosphere above the diaphragm, an inlet pipe for natural gas connectedto the bottom of the housing, an axially disposed valve stem in thehousing connected to the diaphragm and projecting above the housing, ahelical spring sleeved on the valve stem above the housing tending tohold the diaphragm against displacement, a small valve on said stem, alarge disc valve seating againstthe vbottom of the housing in said inletpipe and having a seat receiving said small valve, and a tubular stemfor the large valve extending upwardly in the housing to a pointadjacent thesdiaphragm, the arrangement being suchthat a small vacuumcreated underneath the diaphragm by suction will force open the smallvalve and subsequently increased vacuum will displace the diaphragm toimpinge the same against said tubular lvalve stem and open the largevalve.

2. A natural gas carburetor comprising a housing, a transverselydisposed diaphragm in the housing, the housing being vented to theatmosphere above `the diaphragm, an inlet pipe 'for natural gasconnected to the bottom of the hous-` ing, an axially disposed valvestem in the housing connected to the diaphragm and projecting above thehousing, a helical spring sleeved on the valve stem above the housingtending to hold the dia# phragm against displacement, a small valve onsaid stem, a large disc valve seating against the bottom of the housingin said inlet pipe and having a seat receiving said small valve, atubular stem for the large valve disposed concentric with the stem ofthe small valve, said tubular stem extending loosely through aninletport in the bottom of the housing and being of greater innerdiameter than the small valve stem, said tubular stem being open at thetop and having lateral outlet A openings, said tubular stem extendingup- Wardly in the housing to a point adjacent the diaphragm, and anoutlet pipe for natural gas com-v municating with the housing below thediaphragm and adapted to be connected to the air-intake of aconventional carburetor.

3. A natural gas carburetor comprising a housing, a transverselydisposed diaphragm in the housing, the housing being vented to theatmosphere above the diaphragm, an inlet pipe for natural gas connectedto the bottom'of the yhousing, an axially disposedfvalve stem in thehousing connected to the diaphragm and projecting above thehousing, ahelical spring sleeved on the'valve ,stem above the housingtending tohold the diaphragm against displacement, a small valve on said stem, alarge disc valve seating against the bottom of the housing in said inletpipe and having. a seat receiving said small valve, a vti'lsbularstemior Atherlarge valve extending upwardly in the housing to a pointadjacent the diaphragm, an outlet pipe connected tothe housing vbelowthe diaphragm, a-mixing Ychamber connected tothe loutlet pipe andforming a continuation of theair-v intake of a conventional carburetor,andvalve meansfin the mixing chamberffor` regulating the air supply, thearrangement being such vthata small vacuum created underneath Ythediaphragm by suction through the conventional carburetor will force openthe small valve and subsequently increased vacuum will displacethe'diaphragm to impinge the same against said tubular-valve stem andopen .the large valve. y f I WILLIIAM E. CLAYTON. I

